L1
York
Compressor Lockout After Multiple Trips
York communicating thermostat shows L1 lockout and cooling is disabled
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Repeated high or low pressure trips, Compressor overheating, Persistent low airflow or refrigerant issues, Faulty pressure switch circuit
How to Fix / Troubleshooting
Safety: Shut off power to indoor and outdoor units before inspection.
- Review history: Many York communicating stats show which safety caused the lockout (high pressure, low pressure, etc.). Note this for diagnosis.
- Correct root cause: Follow the relevant steps for high‑pressure (coil cleaning, fan check) or low‑pressure (airflow, leaks) issues before clearing lockout.
- Inspect pressure switch wiring: Look for loose or shorted wires at the high and low pressure switches.
- Clear lockout: Turn off power to the system for at least 30 seconds, then restore. Some stats also require a manual reset in the installer menu.
- If lockout returns: A professional must check refrigerant charge, compressor condition, and safety circuits.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Protection Circuit
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